Things to Know About HFCs

On Saturday, nearly 200 countries signed a deal that would require them to phase out a specific class of greenhouse gases known as hydrofluorocarbons, or HFCs, starting in 2019. The goal is to reduce use of HFCs globally 80% by 2047. Although the chemicals account for only a small fraction of global greenhouse-gas emissions, they are one of the fastest growing greenhouse gases in the world.